^Thernstrom, Stephan (1980), Harvard Encyclopedia of American Ethnic Groups, Cambridge, Massachusetts: Harvard University Press, p. 243, ISBN0-674-37512-2, Both geographic and historical factors distinguish the Cornish as an ethnic group.
^Oxford English Dictionary: "British Isles: a geographical term for the islands comprising Great Britain and Ireland with all their offshore islands including the Isle of Man and the Channel Islands."
^Alan, Lew; Colin, Hall; Dallen, Timothy (2008). World Geography of Travel and Tourism: A Regional Approach. Oxford: Elsevier. ISBN978-0-7506-7978-7. The British Isles comprise more than 6,000 islands off the northwest coast of continental Europe, including the countries of the United Kingdom of Great Britain (England, Scotland and Wales) and Northern Ireland, and the Republic of Ireland. The group also includes the United Kingdom crown dependencies of the Isle of Man, and by tradition, the Channel Islands (the Bailiwicks of Guernsey and Jersey), even though these islands are strictly speaking an archipelago immediately off the coast of Normandy (France) rather than part of the British Isles.